Stringed musical instrument



FIG. 1 is a top plan view of a stringed musical instrument showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a bottom plan view;

FIG. 4 is a front elevational view; and

FIG. 5 is a rear elevational view. 

The ornamental design for a stringed musical instrument, as shown. 